Guide to Halogen Bulbs Shapes
Halogen Lamps are high pressure tungsten filament lamps containing halogen gases. The halogen gases allow the filaments to operate at higher efficacies than incandescent lamps. Halogen lamps also provide brighter, whiter light with better color characteristics, longer service life and improved energy efficiency compared with incandescent light bulb.
Halogen lamps are generally of the “lamp within a lamp” design. The outer “lamp” or jacket is made from a heavy walled borosilicate glass. The inner “lamp” is the tungsten halogen capsule that is made from either glass or quartz and contains a filament, lead wires and a halogen gas mixture.
The shape and size of a bulb is designated by a letter (or letters) followed by a number that indicate the maximum diameter of the bulb in eight of an inch.
For example:
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T10 tubular bulb DIA = 10 / 8 = 1.25 in |
A19 A-Shape (pear bulb) DIA = 19 / 8 = 2.37 in |
PAR38 Bulb DIA = 38 / 8 = 4.75 in |
PAR64 Bulb DIA = 64 / 8 = 8.00 in |
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The following illustrations show some of the most popular halogen bulb shapes:
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